Pitman



. A. WlKL-.UND

PITMAN om 25,1927. l 1,646,435

-Filed March l, 1922.

Patented ot.`25,1927. l f l UNI.'l"-!-..'Dil STATES; PATENT- OFFICE. l

ANDERS W'IKLUND;l 0F CVI-IICAQO, ILLINOIS, ASSIGNOR'TO INTERNATIONALHARVES- V TER COMPANY. F CHICAGO, LLINOIS, A'-CORBORATION OF NEW JERSEY.

PITMAN.

This invention 4relatesvtovpitman connec* tions for mowers and likemachines.

In` a pitman havingoneor more resilient jaws for clamping the bearingmember of` i the vmower lniifehead,` it has beenv found that thegrassward end of the pitman has, in some instances,v become disengaged'or separated from the knife head', I This acci dental separation of thegrassward end ofv l0 thek pitman from the bearing member-on the end of-theknife head has occurred inksonjie instances whenA ,the mower .knifehas en-i countered some tough or unyielding obstruc.-

grassward 'end Vofthe pitrnan from the bear-- ingmember of thel mowerknife head. n

A i further object/ to providea simple and economical `construction orclamping devieeain which'the movable parts are sub- 15'50 stantiallyconfined within thepitmanl straps.

lThese and other objects are accomplished by providinga clamping jaw andmeans for actuating said Vclamping jaw, vsaidv actuating means havingmeans for preventing the accidental v spreading of Y .the v`pitmanlstraps; or ljaws when the-same are v`in clamping-posi,- tion. i Az Inthe acompanying drawings I :have illus- -trated but one embodiment of myinvention, andk in. these"-draw-ings-d 'n f Figure 1 is a plan viewofthe grassward end of apitmanfhaving myy improvement embodieditherein;f 1 y y. i Fig. 2 is aside elevational view'of Fig 1; Fig'.3'is'asectionalrview;k taken on the lines of Fig.2 showing the' pitmaninits inoperative or disengagedfpositiongiy "Figli is a detail'viewpartlyinsection showing the positionof the clamping member'.` Figs' 5 and 6are enlarged detail views of the toggle link members; and.l

V'Fig v7...'is a .detail view ofthe connecting linkfbetween the clampingmember yand the `of-arms 24 of a crank 25.A Itwill be ,noted yvApplicationfiuaivrarehi,1922; sriai Hajraa-179.

l They stubbleward end 10 of the body porl y tion of. the pitmanvpreferably made ofl `wood7 is provided with, and has secured theretobymeansv of rivets 11 resilient jaws or strapsll and 12, which Vin turnare provided With. cupfshaped cavities ory bearingv portions 13 andw14Lrespectivelyl which are adapted to"v receive the ball of the pitmanheady formed y on the knife head of `the mower.y The. resilientjaws areprovided adjacent the cup-shaped portions with registering elongated'apertures 15 arranged longitudinally ywith. respect to the straps. Theinner portions of theseslotted apertures .are provided with` beveledsurfaces 16 for the purposes hereinafter set forth. The bearingor'cup-sh'aped portions 13 and 14; are providedy with inclined outsidesurfaces- 17, which are adapted to be slidably engaged by aclampingjfork member 18 in a manner to 75 force the straps 11 and 12 onthe'spherical bearing member oftheI knife head; kThe clamping member 18is A'provided with out? side inclined surfaces 19adapted to engage theinclinedv sur/faces 16 ofthe straps 11 and l2 inits normalv operation ofunclamping or spreading and releasing the' jaws from the knife` head.The stubbleward end of. the clampingmember` 18 is provided ywith abifurcatedportion-20which is adapted to pilvotallyV receiveia, link 21.`The free .end of the Vlink 21.is provided with a slotted opening22,which slidably receives the pin 23 which in turn is fixed to the freeend that the slot 22 is sufciently'long to permit free Vreciprocation of-the link 21. The crank 25 is pivotal'lymounted in the straps 11 'and 12by the bearing studs 26 and 27 .journaled in the enlarged portions 28and 95 29 respectively of the straps 11and y12. One

end ofthe crank member 25 is provided with a'protruding square shank orwrench engaging portion 30, which is adapted to be maknipul-atedbyl .awrench or other tool vin 100 clamping andk 'unclamping Ithe jaws of thepitman from the knife head.` 'Between the armsf24 of the crank 2.5 isaflattened shoulder portion` 25.y for `the purpose hereinafter. setforth. TheV toggle 4link 21 isy provided 105 with a resilientmeanscomprising a spring 31 surrounding ,the link v21an'd exten-ding Yyfromthe yportion v20 of the clamping memported on .the link 21.l Thecollar 32 is ..110

soY

provided with a narrowed or reduced ,dportion 33v adapted to lit betweenthe arms 211 and engage the pin 23 in the normal operation of clampingthe pitman.

It will be notedthat the spring31 normally forces the clamping member 18grasswardly with respect to the pitman proper, and therefore holds thestraps or jaws 11 and 12 under spring tension -inclamping the sphericalbearing member of the `knife head. It will also vbe noted that when theclamping member 18 is in its clamping positionv or the position shown inFig.`1 that this member 18 is limited in its movement stubblewardly withrespect to the pitman by reason of the slotted end oflink member 21butting against the flattened portion 25 of the crank 25. In otherwords,when the p itman is in the position shown in Fig. 1 the straps 11 and 12cannot become accidentally disengaged from the bearing member of theknife head by reason of the knife. encountering some obstruction.` `Itshould be appreciated that when the parts are in clamp- Ving position,"the" stubbleward end ofthe link 21 does notv 'abut' the flattenedshoulder portion 25 on the crank, `but rather is slightly spacedtherefrom. Figure 2 clearly shows this. Should, however, `anbbstructionbe `encountered bythe cutting appara-` tu'sof the mower, or the like,then, by means of the sliding pivotal` connection ofthe link with thecrank, the link will move/to abut the shoulder portion. k ment of thelink is prevented; theparts are securely locked, and accidentalunclamping of thepitman jaws Ais eifectually prevented. :The strapmember 12 is provided on its inner side with a projection 34 adapted toengage or'form a stop for thearm 24 ofthe crank member 25, asclearlyshown in'Fig.

' 1. When it is desired to releasethe bearing member of the knife headfrom the pitman or from thel cup-shaped members 13 andf14 a wrench isapplied to the square shank 30,`and the same is swung in a direction torelease the crank25 from the stop 34.# to a position `shown vin Fig; 3,inV which position the `clamping member 18 is obviously withdrawn `fromthe inclined surfaces -17 `of thestraps 11 yand 12 until the inzlinedsurfacesl19 of the clamping member 18 Yengages the `inclinedsurfaces 16of the straps 11 and 12, during which engagement the straps "11 and 12are positively spread and thereby releasing the bearing member of theknife head. `When it is desired to clamp the bearing member to theVpitman "proper the reverse operation is performed. From the abovedescriptionv it will be seen that I `have provided a simple and easilyoperatedA construction for connectingthe pit- `man to the knife headfofa mower or" the like lin such a manner that thewear between theco-operating parts will be automatically Thus further move- 1. In apitman connection, a pitman havk ing resilient ]aws, a Jaw clampingmember,

a link connected kto said clamping member,

ay crank pivoted to said pitmanand con-v nected to said link, and meanscausing' relative longitudinal movement of said link andV clampingmember withrespecttosaid crank after said clamping memberis in clampingposition, whereby `oneend ofthe link and a portion of the crank -abut*to lockfth parts in such clamping position. 1

2. In a pitman connection,a` pitman having resilient jaws', a clampingmember piv` `oted to said jaws, and meansincluding a' slotted link`connecting `the member and smv aws for preventingthe accidentalunclamp-N ingV of `said clamping member after-said member 1s 1-nclamping position.'

3. In a pitman connect1on, a pitman having-a resilient jaw, amovablemembervfor clamping the jaw, a crank for-actuating the movablemember, a shoulder 'portion on the crank, oneend of themovable-memberwhen in normal Vclam ing positionfbeing spaced from saidshoul er portion,and means causlng'sald movable member `and `shoulderpor-` tion to abut to prevent accidental unclampingof the jaw.` i

4. In a` pitman connectiorna pitmanfhav-V Y ing a resilient jaw, aVlongitudinally 'movable member for clamping the liaw, a crank foractuating the movablefmember, a `shoulder portionV on the crank, onelend of vthe movable member whenwin normal clamping position being spacedfrom said shoulder portion, and means causing said movable L member andshoulderportion toabut to prevent longitudinal movement ofthe movablemember. F f a y 5. `In a pitman connection, a pitman having resilientstraps, a reciprocable member carried by the Vstraps for` clampingf'saidstraps, a crank journalled in the' strapstfor reciprocating the Mmember,`a shoulder pory tiononthe crank, one end of the reciprocable memberwhen in normal clamping'position being spaced from the` shoulderportion, Vand means causingsaid reciprocable` member and shoulderportion to abut to" prevent accidental unclamping of the straps;

"6'. Ina pitman connect1on,.a pitmanV having resilient straps, clampingmeans for'the straps Vincluding a link and a cranky the crank having ashoulder portion, one end of vthe link lying spaced from the shoulder onthe crank when the clamping means is in clamping position, and meanscausing the link to abut the shoulder to prevent accidenf' nectionbetween the link and crank causing the link to abut the .shoulder toprevent accidental unclamping of the straps.

.8. In a pitman connection, a pitman having resilient straps, clampingmeans for the straps including a movable slotted link, a two-armed crankjournalled in the straps,

a pin carried by the arms of the crank, the

slotted end of the link being carried by the pin, and la shoulderportion between the twok arms of the crank, the shoulder and end of thelink being adapted to cooperate in clamping position of the parts toprevent accidental unclamping thereof.

9. Ina pitman connection, a pit-man having resilient straps, a clampingmember for the straps, a-crank and a link for actu-ating the clampingmember, the link being pivoted d .s

at onev end to. the clamping member, the crank being pivoted at one endto the straps, and a sliding pivotal connection between the other endvof the crank and the other endl of V the link causing both longitudinaland lateral movement of the link, al shoulder on the crank to limitlongitudinal movement of the link in clamping position of the parts,

and other means for limitingthe lateral movement' of the crank and linkin one direction. Y

10. In a pitman connection, a pitman having resilient straps, a clampingmember including a crank and a link pivotally carried between saidstraps, said link having. both lateral and longitudinal movement, meansfor limiting the longitudinal movement of .said link for holding theclamping member in clamping position by causing the link to abut thecrank, and stops formed on the straps fory limiting the lateral throw ofthe clamping member in one direction b causing one of the said memberscomprising the. clamping member to contact said stops.

In testimony whereof I ax my signature.

ANDERS WIKLUND.

